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Logic gates: AND, OR, NOT, NAND, NOR, XOR, XNOR MCQs

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1. The output of an AND gate is high (1) when:





2. The output of an OR gate is high (1) when:





3. The output of a NOT gate is:





4. The output of a NAND gate is high (1) when:





5. The output of a NOR gate is high (1) when:





6. The output of an XOR (exclusive OR) gate is high (1) when:





7. The output of an XNOR gate is high (1) when:





8. Truth table for 2-input AND gate shows:
0 0 0
0 1 0
1 0 0
1 1 1
Which statement is true?






9. Truth table for 2-input OR gate shows:
0 0 0
0 1 1
1 0 1
1 1 1
Which statement is true?






10. Truth table for 2-input NOT gate shows:
0 1
1 0
Which statement is true?






11. A NAND gate is a combination of which two gates?





12. A NOR gate is a combination of which two gates?





13. An XOR gate is often used in circuits that perform:





14. Which of the following gates is known as a universal gate?





15. Which gate is commonly used for digital subtraction?





16. An XNOR gate is often used to check if two values are:





17. Output of an XOR gate when both inputs are 0:





18. In a 3-input AND gate, the output will be 1 only if:





19. Correct Boolean expression for the AND gate:





20. Correct Boolean expression for the OR gate:





21. De Morgan’s law states that:





22. In a circuit with a NAND gate, output if both inputs are 1:





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